(a) Determine k that renders f(x) a valid density func- tion. (b) Find the probability that a random error in mea- surement is less than 1/2. (c) For this particular measurement, it is undesirable if the magnitude of the error (i.e., [x]) exceeds 0.8. What is the probability that this occurs?

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3.30 Measurements of scientific systems are always
subject to variation, some more than others. There
are many structures for measurement error, and statis-
ticians spend a great deal of time modeling these errors.
Suppose the measurement error X of a certain physical
quantity is decided by the density function
[k(3-x²),
f(x) =
10,
(a) Determine k that renders f(x) a valid density func-
tion.
(b) Find the probability that a random error in mea-
surement is less than 1/2.
−1≤x≤1,
elsewhere.
(c) For this particular measurement, it is undesirable
if the magnitude of the error (i.e., |x|) exceeds 0.8.
What is the probability that this occurs?
Transcribed Image Text:3.30 Measurements of scientific systems are always subject to variation, some more than others. There are many structures for measurement error, and statis- ticians spend a great deal of time modeling these errors. Suppose the measurement error X of a certain physical quantity is decided by the density function [k(3-x²), f(x) = 10, (a) Determine k that renders f(x) a valid density func- tion. (b) Find the probability that a random error in mea- surement is less than 1/2. −1≤x≤1, elsewhere. (c) For this particular measurement, it is undesirable if the magnitude of the error (i.e., |x|) exceeds 0.8. What is the probability that this occurs?
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